Exhaust fan



June 3, 1.930. -M. PHI-:LPS 1,762,028

EXHAUST FAN Filed March l0, 1926 zSHZ-ofgeys.

Patented June 3, 1930 UNITED STATES PATENT OEI-'TCE MORTON F. PHELPS, 0F LITTLE ROCK, ARKANSAS, ASSIGNOR TO PHELPS MANUFACTUR- ING COMPANY, A COPARTNERSHIP PHELPS, OF LITTLE ROCK, ARKANSAS` a ooNsIs'rTNG oF FRANK EXHAUST FAN Application filed Maren 1o, 192s. serial No.y 93,630.

The purpose of this invention 'is to provide a perforated disk or screen member for use with blast wheels, and so'arranged that it may be applied or removed from the wheel without interfering with the running balance of the latter. It consists in certain features and elements of construction herein shown and described as indicated by the claims.

Inthe drawingsz- Figure 1 is a side elevation of a blast wheel or blower of invention is applied.

Figure 2 is a perspective view of the same with part of the casing broken away to show interior construction.

Figure 3 is a vertical axial section taken through the assembled wheel and screen disk, but with some of the wheel paddles removed.

Figure 4 is a side elevation showing the hub and a fragment of the perforated disk .as applied to the shaft of the wheel.

Figure 1 illustrates a typical blast wheel comprising a base casting, 1, having jourv nal bearings, 2, 2, which carry the shaft, 3,

and its drive pulley, 4. On the projecting l end of the shaft is secured the hub, 5, of

the blast Wheel, while the blades or paddles, 6, are attached to radial ribs, 5", of the hub by extending arms, 7, of iat stock riveted t0 the ribs, 5a, and to the blades. This wheel is mounted to revolve in the casing comprising side walls, '8, 8, tied together by bolts, 9, which are arranged adjacent the edges of the side plates, 8, and just outside the peripheral wall, 10, which is thus clamped between the side plates. The casing is formed with the usual outlet or discharge opening, 11, and inlet, 12, the latter being concentric' Heretofore, when the vcharacter of the work has required a screen or perforated disk to be applied to the blast wheel at the inlet side, such a disk has been attached by means of lugs or ears engaging the outer edge of the disk with the blades of the wheel, and such assembly was then placed in running balance in order to insure smooth operation. However, this mode of constructhe type to which this with the end of the shaft, 3.`

shown, the blast wheel 5, is made fast to the shaft, '3, by means the hub, 14, is

the blast wheel proper.

PHELPS AN D MORTDN F. l

formed with a groove, 16, dimensioned to fit over the projecting end of the key, 15, so that the latter will not interfere with mounting the screen, 13, on the shaft. At the opposite side the' hub, 14, is provided with a set screw, 17, for tightening the hub, V14, in position, though it will be evident that `the end portion of the key, 15, will readilyserve to transmit thel disk, 13. The screen disk, 13, assembled with its hub, 14, and set screw 17, vis balanced with respect to the axis o yits central bore before it is placed on the shaft, 3, andthe blast wheel itself is individually balanced on the shaft before the screen disky is yapplied. Thus when the disk becomes worn or is to be replaced for any other reason, it is only necessary to loosen the set screw, 17, and remove it while a substitute disk, also previously balanced, may its place.

I claim 1. In a power driven blast wheel including a casing formed with a discharge opening and in one side with an inlet, the combination of a shaft and means for applying power thereto,a fan wheel fixed to the shaft and a screen comprising a disk and acentral hub to which it is secured and by which it is fixed to the shaft independently of the fan wheel, said screen disk being prebalanced for rotation about the axis of its hub the blast wheel blades, and said casing having a removable side whereby said screen is removable and replaceable by another 'prebe quickly set in,

driving torque to the screen of its casing formed With the lnlet, to

separate solid matter i balanced screen Without disturbing the bal` ance of the blast Wheel.

2. In un exhaust fan comprising a casing formed with a discharge opening and in oneside with an inlet; a power driven shaft extending into the casing, a balanced fan wheel Within the casing and secured to the power driven shaft, an independently prebalanced screen secured to the power shaft and disposed between the fan Wheel and side from air drawn through the Ascreen and prevent such solid matter from Contact with the fan Wheel blades, the casing having a removable side whereby said screen is removable and replaceable by another prebalanced screen without Wheel.

MoRToN F. PHELPS.

disturbing the balance of the fan 

